powerpc/process: Remove target specific __set_dabr()

__set_dabr() are simple functions that can be inline directly
inside set_dabr() and using IS_ENABLED() instead of #ifdef
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/c10b263668e137236c71d76648b03cf2cd1ee66f.1607076733.git.christophe.leroy@csgroup.eu

arch/powerpc/kernel/process.c

@@ -806,29 +806,6 @@ static void switch_hw_breakpoint(struct task_struct *new)
 #endif /* !CONFIG_HAVE_HW_BREAKPOINT */
 #endif	/* CONFIG_PPC_ADV_DEBUG_REGS */
 
-#ifdef CONFIG_PPC_ADV_DEBUG_REGS
-static inline int __set_dabr(unsigned long dabr, unsigned long dabrx)
-{
-	mtspr(SPRN_DAC1, dabr);
-	if (IS_ENABLED(CONFIG_PPC_47x))
-		isync();
-	return 0;
-}
-#elif defined(CONFIG_PPC_BOOK3S)
-static inline int __set_dabr(unsigned long dabr, unsigned long dabrx)
-{
-	mtspr(SPRN_DABR, dabr);
-	if (cpu_has_feature(CPU_FTR_DABRX))
-		mtspr(SPRN_DABRX, dabrx);
-	return 0;
-}
-#else
-static inline int __set_dabr(unsigned long dabr, unsigned long dabrx)
-{
-	return -EINVAL;
-}
-#endif
-
 static inline int set_dabr(struct arch_hw_breakpoint *brk)
 {
 	unsigned long dabr, dabrx;
@@ -839,7 +816,19 @@ static inline int set_dabr(struct arch_hw_breakpoint *brk)
 	if (ppc_md.set_dabr)
 		return ppc_md.set_dabr(dabr, dabrx);
 
-	return __set_dabr(dabr, dabrx);
+	if (IS_ENABLED(CONFIG_PPC_ADV_DEBUG_REGS)) {
+		mtspr(SPRN_DAC1, dabr);
+		if (IS_ENABLED(CONFIG_PPC_47x))
+			isync();
+		return 0;
+	} else if (IS_ENABLED(CONFIG_PPC_BOOK3S)) {
+		mtspr(SPRN_DABR, dabr);
+		if (cpu_has_feature(CPU_FTR_DABRX))
+			mtspr(SPRN_DABRX, dabrx);
+		return 0;
+	} else {
+		return -EINVAL;
+	}
 }
 
 static inline int set_breakpoint_8xx(struct arch_hw_breakpoint *brk)